今天寫App介面的時候需要傳遞加密資料給APP端，於是就寫了下面的DES加密類，親測正確程式碼如下

class CryptDes {

    function __construct(){
        $this->key = 'codelovers'; //金鑰
        $this->iv = '15548632'; //偏移量
    }

    /*
     * 加密
     */
    function encrypt($input){
        $size = mcrypt_get_block_size(MCRYPT_DES,MCRYPT_MODE_CBC); //3DES加密將MCRYPT_DES改為MCRYPT_3DES
        $input = $this->pkcs5_pad($input, $size); //如果採用PaddingPKCS7，請更換成PaddingPKCS7方法。

        $key = str_pad($this->key,8,'0'); //3DES加密將8改為24
        $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');

        if( $this->iv == '' )
        {
            $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }
        else
        {
            $iv = $this->iv;
        }

        @mcrypt_generic_init($td, $key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $data = base64_encode($data);//如需轉換二進位制可改成  bin2hex 轉換
        return $data;
    }

    /*
     * 解密
     */
    function decrypt($encrypted){
        $encrypted = base64_decode($encrypted); //如需轉換二進位制可改成  bin2hex 轉換
        $key = str_pad($this->key,8,'0'); //3DES加密將8改為24
        $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,'');//3DES加密將MCRYPT_DES改為MCRYPT_3DES
        if( $this->iv == '' )
        {
            $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }
        else
        {
            $iv = $this->iv;
        }
        $ks = mcrypt_enc_get_key_size($td);
        @mcrypt_generic_init($td, $key, $iv);
        $decrypted = mdecrypt_generic($td, $encrypted);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $y=$this->pkcs5_unpad($decrypted);
        return $y;
    }
    function pkcs5_pad ($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }
    function pkcs5_unpad($text){
        $pad = ord($text{strlen($text)-1});
        if ($pad > strlen($text)) {
            return false;
        }
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad){
            return false;
        }
        return substr($text, 0, -1 * $pad);
    }
    function PaddingPKCS7($data) {
        $block_size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);//3DES加密將MCRYPT_DES改為MCRYPT_3DES
        $padding_char = $block_size - (strlen($data) % $block_size);
        $data .= str_repeat(chr($padding_char),$padding_char);
        return $data;
    }
}
 

用法如下：

$str = 'www.codelovers.cn'; $des = new CryptDes();
$mres = $this->_des->encrypt($str); //加密
$jres = $this->_des->decrypt($mres);//解密